Turns out the cat is going down the stairs.

The cat is going down.
9Gag.com and Megan Willett/Business Insider

As Business Insider explained, the pebbled texture you see on the stairs isn't mosaic tile, it's what's known as the stair's rise, and the part that some people thought looked like a wooden lip is actually the stair nose. The nose overhangs the riser, which has a pebbled texture. A similar set of stairs can be seen in the inset of the photo above.

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The face of the dog in the back of this photo threw a lot of people off.

Fortunately, there's nothing wrong with the dog. It's just laying down with its head turned to the side.

The dog's odd position was what stumped so many people. It has its back arched and its head is turned almost to the point where it's upside down. There was also a part of its mouth that looked like an eye resting on its cheek.

Turns out it's just two separate dogs, and one is peeking its head around the door. Because the dogs look identical, it looks like they're conjoined.

We reached out to Reddit user NegativePitch, who said that the dogs' names are Pumbaa and Nala (from left to right). They didn't provide an explanation for the photo though. But Reddit user AbroGaming made a compelling suggestion.

As the photo above shows, it seems that Nala (the dog on the right) is peeking out from behind the door and leaning into Pumbaa (the dog on the left) who is sitting with two paws next to the door. If you look hard enough, you can see the outline of Nala's fur against Pumbaa's body (the arrow is pointing to it in the above photo).

But it's actually just a perfectly-timed photo.

The dog that's standing behind the woman on the left just so happened to have its head behind her when this photo was taken. And because both the dog and the woman's pants are black, the part of the woman's pants that are visible blends in with the dog's fur. Since her legs are mostly covered by the table, it creates the illusion that the lower half of the woman's body is made up of the dog's two back legs.

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The beginning of this video makes you think that this cute little Corgi is about to go skydiving.

This Airedale look like a giant. It seems to dwarf the house and children in the background.

This Airedale's size was made possible thanks to forced perspective, a photography technique that creates the the illusion that something in a photo is much larger or smaller than it actually is in reality.

According to PetaPixel, by carefully controlling the distance between the camera lens and a subject (the dog in this case), you can make it seem like all the subjects of a photo are in the same space, when really some are in the foreground and some are in the background. This then creates the illusion that a subject that is farther from the lens is smaller than a subject that's right in front of the lens — even though in reality the far-away subject is larger.

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This cat poster may seem ordinary, but walking past it will make you think otherwise.

This is due to a concept known as the hollow-face illusion, which occurs when humans perceive something that is actually concave (pushed in) as convex (pushed out). Because this poster is placed on a fence that has ridges, the cat's face is concave or hollow. According to the New World Encyclopedia, hollow faces appear to move their eyes faster than the speed at which the viewer is moving.